Commit 1e6ce3b8 authored by Alex Deucher's avatar Alex Deucher Committed by Luis Henriques

drm/radeon: work around a hw bug in MGCG on CIK

commit 4bb62c95 upstream.

Always need to set bit 0 of RLC_CGTT_MGCG_OVERRIDE
to avoid unreliable doorbell updates in some cases.
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 17a29b83
...@@ -5979,6 +5979,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable) ...@@ -5979,6 +5979,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable)
} }
orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE); orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE);
data |= 0x00000001;
data &= 0xfffffffd; data &= 0xfffffffd;
if (orig != data) if (orig != data)
WREG32(RLC_CGTT_MGCG_OVERRIDE, data); WREG32(RLC_CGTT_MGCG_OVERRIDE, data);
...@@ -6010,7 +6011,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable) ...@@ -6010,7 +6011,7 @@ static void cik_enable_mgcg(struct radeon_device *rdev, bool enable)
} }
} else { } else {
orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE); orig = data = RREG32(RLC_CGTT_MGCG_OVERRIDE);
data |= 0x00000002; data |= 0x00000003;
if (orig != data) if (orig != data)
WREG32(RLC_CGTT_MGCG_OVERRIDE, data); WREG32(RLC_CGTT_MGCG_OVERRIDE, data);
......
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